Island



UNITED STATES PATENT OFFICE.

DANIEL W. SNELL, OF WOONSOCKET, RHODE ISLAND.

' LOOM.

vSpecification of Letters Patent No. 12,970, dated May 29, 1855.

To all lwhom 'it may concern:

Be it known that I, DANIEL W. SNELL, of Woonsocket, in the county of Providence, and State of Rhode Island, have invented an Improved Mechanism for Regulating the Delivery or Rotary Movement of a Yarn Beam or Roller of a Loom for VVeaving Cloth; and I do hereby declare that the same is fully described and represented in the following specification and the accompanying drawings, letters, figures, and references thereof.

My invention is what would be termed in mechanical parlance a new or improved let off motion.

In Figure 1, I have represented a top view of a loom frame and my said invention as applied to it and the yarn beam thereof; only such parts of the loom as may be necessary t0 my invention being therein eX- hibited. Fig. 2, shows an end view of the loom and my said mechanism. Fig. 3, is a transverse section of a loom frame, the same being taken through the yarn beam and made to exhibit an inner side view of my said mechanism. I

In the said drawings, A, denotes the frame of the loom; B, the main shaft and C, the yarn beam or roller around which the warps are wound and from which they are delivered by my invention as fast as may be necessary during the process of weaving. The said main shaft, B, carries an eccentric, D, upon which rests the longer arm of a lever, E, that is hung or made to play loosely on a stud or shaft F, supported by and made to rotate in a bracket, Gr. To the upper arm of the lever, E, a pawl, H, is jointed, such pawl being made to work upon the periphery of a ratchet gear, I, that is fixed upon the shaft, F. A bevel gear, K, supported on the shaft, F, so as to rotate with it, engages with and drives another bevel gear, L, that is sustained by a horizontal shaft, M, which is supported by the bracket, G, before mentioned and carries a worm or endless screw N, that works into a gear O, fixed on the shaft of the yarn in beam. Such parts applied to the yarn beam and the main shaft of the loom frame may be termed the driving machinery; thatwhich remains to be described may be termed the regulating apparatus.

R, is a gage or regulating lever, which is made to rock or turn on the shaft F. The longer arm of this lever while the loom is in operation rests against the curved periphery or surface of the yarn on the yarn beam. the other arm being bent around the beveled gear K, and jointed to the one arm of a rocker lever, S, that plays freely upon the shaft, F, as a fulcrum and supports and carries a curved slide, T, that is made to cover a portion or arc of the periphery of the ratchet gear, I, and is interposed between said gear and the pawl I-I. The lever, R, having one arm resting against the cylindric surface of the yarn on the yarn beam moves toward the axis of the beam as the warp thread is unwound from the beam and as the said lever approaches the said axis, its shorter arm of course will be depressed so as to move the slide, T, in a direction to- Ward the breast beam, U, of the loom, thereby exposing more of the teeth of the ratchet to the action of the pawl. Such pawl has a constant reciprocating movement and during its backward movement it will rise from the periphery of the ratchet and move upon the top surface of the slide, T. If we suppose the cylinder of yarn on the beam to be fifteen inches in diameter when the beam is full, and the beam itself to be five inches in diameter, it will be evident that the beam must be turned three times as fast to let off from a five inch diameter as would be necessary. IVe will also suppose that the slide, T is so placed on the ratchet that at the starting of the loom with a full beam, the beam shall commence to deliver or let off at the rate required. Thus it will be seen that as the cylinder of yarn on the yarn beam decreases in diameter the slide, T, will continue to move back toward the breast beam so as to gradually uncover more of the teeth of the ratchet to the action of the pawl and of course gradually increase the extent of rotary movement of the ratchet wheel. Now if at the eXtreme back movement of the slide T, it is made to uncover just the number of teeth necessary to deliver the amount re- 'quired at a tive inch diameter of warp on the beam, the delivery between the two eX- tremes and as fast as the cylinder of yarn decreases in diameter will always be a regular quantity.

I claim* In combination with the yarn beam and mechanism for producing rotary motion of it, mechanism made to separate substantially as described and governed in its action by the varying diameter of the yarn beam itself as specified; the same producing upon In testimony whereof, I have hereunto the yarn beam a positive let Off or reguset my signature on this twenty-third day l0 lar delivery movement, that is independent of September A. D. 1854.

of or not Uoverned or controlled either by 5 any positive take up mechanism, or any' DANIEL T SNELL' mechanism to regulate the delivery of the Witnesses: Warps by tension and rigidly hold them, WILLIAM O'. MASON,

When the lay beats up against the weft. IRA W. ARNOLD. 

